In order to understand which spells to use in which situations, you should try to understand each spell and its ingredients and intentions in context. One way to contextualize spells is to view them against a successive series of contextual frames. There are several basic ways to characterize spell work; here are five of the most useful frames:
1) energetic type (creative versus coercive)
2) kinetic type (static or binding versus productive of movement)
3) directional type (drawing versus repelling)
4) condition or situation type (love, money, protection, etc.)
5) physical format type (container spell, candle spell, bathing spell, etc.)
6) symbolism of ingredients (range of effects associated with ingredients)
It helps to imagine all of these categories as overlapping and non-exclusive ways of contextualizing a spell. That is, rather than a tree-branching hierarchy by which one might "key out" a spell in the way that botanists "key out" species of plants, one can place any given spell along the polarity axis or among the multiple-choice sub-sets in each of the five categories above and then compare it to other spells which are situated nearby, relationally speaking.
ConjureMan described a type of egg spell to control someone's mind in a dominating manner. To use a dominating and controlling spell of this type on a lover would not be as appropriate as using a subtle and bewitchingly controlling spell. Let us look at the spell ConjureMan gave, and see why it is not suitable for love or romance work but might find use in a loveless and static marriage:
First, viewed according to its placement in category #1 (energetic type), it is coercive, not creative. Love spells span the entire range from creative ro coercive, so this contextual category is unimportant in the present case.
Then, we can assess this spell according to its placement in category #2 (kinetic type). In this schema, ConjureMan's egg spell is a static spell; the intention is to produce stasis in the target, for once deployed and effected in the life of the targeted individual, the spell is not expected to produce further changes within the person's emotions, physical health, or location. Kinetic stasis may render the spell unsuitable for a love spell, since love spells, by their very nature, are highly kinetic. However, there is nothing to argue against its use in a static marital situation.
Next, we note that the spell's directional type (category #3) is neutral. As a static spell (category #2) and a neutrally directional spell that neither draws nor repels, we can say that this spell merely attaches itself to the target, who is then affected by it, regardless of whether he draws nearer to or moves farther away from the spell-caster. This neutrality of motion may render the spell unsuitable for a love spell, since love spells, by their very nature, are generally drawing, but, again, its non-directionality may mean that it is suitable for use in a permanent marriage of long standing.
The condition this spell addresses (category #4) is rulership or control. There is a very slight overlap between the condition of rulership and the condition of love, but since this spell is a static, non-kinetic, non-drawing spell, it would hardly be suitable for even dominating love work, unless the relationship were already permanently fixed through marriage.
Within the description of physical formats (#5 above), there are hundreds of basic rootwork spells, including a great many container spells. Each physical format type has further sub-types, such as container spells worked within paper, within cloth, within boxes, within bottles, within eggs, and so forth. The fact that this is an egg spell is more or less unimportant to whether it can be used in love work, since there are so many egg spells, worked for various purposes, such as an egg spell to move someone away, an egg spell to break up a marriage, an egg spell to ease the pains of babies' teething, etc.
Finally, this spell uses what neverfit called "some nasty ingredients." Category #6, above, does not consist of hard and fast rules of what ingredients can and should be used in every spell, but it encourages us to consider the typical range of effects with which each ingredient is associated. In this casem while Poppy (for confusion) and Calamus (for control and rulership) are quite common in coercive love spells of all types, and Pepper (to enflame, curse, or send away) has ambiguous employment in coercive love-revenge spells, it is almost unheard of to employ Black Mustard Seeds (for cursing) in love-drawing spells, and thus this spell does not "read" like a typical love spell to someone parsing its ingredients list. Only the inclusion of the optional Dirt Dauber's Nest would point to this being a very intensely dominating love spell -- Dirt Dauber's Nest is used, among other things, to keep a husband entirely subjugated to his wife.
In sum, the spell that ConjureMan gave was not a typical love spell, for the multiple reasons stated above. It could, however, be used by a woman to bind, control, and subjugate a man to whom she was already firmly and irrevocably married and whom she, in some measure at least, also hated.
By the way, there a number of other frames that are useful in the contextualization spells -- ethnic or cultural origin, religious components if any, inclusion or non-inclusion of traditional ingredients, etc. Those frames were not relevant in this case, but there are times when i use these and other frames as i am trying to understand the origin, intention, and potential efficacy of a spell that is presented to me.
Hoodoo is not just a simple list of spells -- it is a complex system of beliefs and practices, and the more you understand the orderly patterns underlying that complexity, the better a practitioner you will become.